Add initialization for structures

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/tests/suites/test_suite_ecjpake.function b/tests/suites/test_suite_ecjpake.function
index ab672a8..2246f2d 100644
--- a/tests/suites/test_suite_ecjpake.function
+++ b/tests/suites/test_suite_ecjpake.function
@@ -110,6 +110,8 @@
     mbedtls_md_type_t valid_md = MBEDTLS_MD_SHA256;
     mbedtls_ecp_group_id valid_group = MBEDTLS_ECP_DP_SECP256R1;
 
+    mbedtls_ecjpake_init( &ctx );
+
     TEST_INVALID_PARAM( mbedtls_ecjpake_init( NULL ) );
     TEST_VALID_PARAM( mbedtls_ecjpake_free( NULL ) );